Navigation risk assessment method based on flow conditions: A case study of the river reach between the Three Gorges Dam and the Gezhouba Dam

Zhang, Shanghong; Jing, Zhu; Li, Wenda; Wang, Long; Liu, Dawei; Wang, Taiwei

doi:10.1016/j.oceaneng.2019.02.016

Cited by 31 publications

(16 citation statements)

References 19 publications

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“…There are several noticeable perilous waterways between the Three Gorges Dam and the Gezhouba Dam. The river section is about 38 km long [40,41]. Bed elevations measured in October 2008 provided by the Three Gorges Navigation Authority were used as the initial bed topography.…”

Section: Navigable Flow Simulation Casementioning

confidence: 99%

Implementation of a Local Time Stepping Algorithm and Its Acceleration Effect on Two-Dimensional Hydrodynamic Models

Yang

et al. 2020

Water

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The engineering applications of two-dimensional (2D) hydrodynamic models are restricted by the enormous number of meshes needed and the overheads of simulation time. The aim of this study is to improve computational efficiency and optimize the balance between the quantity of grids used in and the simulation accuracy of 2D hydrodynamic models. Local mesh refinement and a local time stepping (LTS) strategy were used to address this aim. The implementation of the LTS algorithm on a 2D shallow-water dynamic model was investigated using the finite volume method on unstructured meshes. The model performance was evaluated using three canonical test cases, which discussed the influential factors and the adaptive conditions of the algorithm. The results of the numerical tests show that the LTS method improved the computational efficiency and fulfilled mass conservation and solution accuracy constraints. Speedup ratios of between 1.3 and 2.1 were obtained. The LTS scheme was used for navigable flow simulation of the river reach between the Three Gorges and Gezhouba Dams. This showed that the LTS scheme is effective for real complex applications and long simulations and can meet the required accuracy. An analysis of the influence of the mesh refinement on the speedup was conducted. Coarse and refined mesh proportions and mesh scales observably affected the acceleration effect of the LTS algorithm. Smaller proportions of refined mesh resulted in higher speedup ratios. Acceleration was the most obvious when mesh scale differences were large. These results provide technical guidelines for reducing computational time for 2D hydrodynamic models on non-uniform unstructured grids.

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Section: Navigable Flow Simulation Casementioning

confidence: 99%

Implementation of a Local Time Stepping Algorithm and Its Acceleration Effect on Two-Dimensional Hydrodynamic Models

Yang

et al. 2020

Water

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“…Unsteady flow resulting from an abrupt change in the flow rate from hydraulic structures (e.g., pumping station, spillway, ship lock, etc.) impacts the stabilization of water supply system (Baghlani 2014) and also alters navigable flow conditions (Liu et al 2012;Zhang et al 2019;Yang et al 2020). The effects of dam discharge, hydropower unit regulations, lock operations, and other hub scheduling modes on the velocity, flow pattern, and surge in the channel are currently being investigated by domestic and international scholars using prototype observations, physical model tests, and numerical simulation techniques (Bravo & Jain 1991;Xue 1994;Stockstill et al 2004;Maeck & Lorke 2014;Shang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…However, in terms of hydrodynamic models, a one-dimensional model fails to reflect exactly the navigable flow conditions based on a handful of cross-sectional data; while a three-dimensional model occupies server memory resources and it proves to be time-consuming. In modelling the waterway flow, a twodimensional model based on the assumption of hydrostatic pressure is feasible and effective in actual engineering applications (Zhang et al 2019). To sum up, a great deal of previous work has mainly focused on the navigable flow conditions in the shallow waterway.…”

Section: Introductionmentioning

confidence: 99%

Effect of ship-lock-induced surges on navigation safety in a branched lower approach channel system

Wan

Wang

et al. 2022

Journal of Hydroinformatics

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Ships docking and traveling in a branched lower approach channel system are at risk from surges caused by multi-lane locks during emptying operations. For this reason, water-level variations in the lower approach channel in response to discharge, interval running time, and outlet location of lock operations were studied using a 2-D hydrodynamic model validated by physical model tests, and the impact of water level variation on navigation safety under extreme operation scenarios of a quadruple-lane lock group was identified. Results indicated that discharge and interval running time of lock emptying had the greatest impact on the water level variation at the lock head. Water level variation at the lower lock head of the ship lift exhibited a trend of first decreasing and then increasing with the increment of the discharge from the lock chamber into the outer river. Specifically, the surge height at the lock head of the ship lift reached the minimum when approximately 40% of the discharge generated by dual-lane locks during emptying operations was released into the outer river. Overall, the simultaneous operation of quadruple-lane lock group and unit load rejection should be avoided in engineering applications.

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“…In order to enhance spatial analysis capability, the spatial multi-objective decision method was applied to the navigation risk estimation research. For instance, Fuzzy-AHP [21,22] and the grey relationship analysis (GRA) method were used to weigh evaluation criteria, and a navigation risk evaluation model based on spatial multi-decision technology was constructed [23]. Questionnaire data and expert experience data have also been used [21,22], which led to strong subjectivity, and the study by [22] regarding low cloud data was used to replace the sea fog.…”

Section: Introductionmentioning

confidence: 99%

Fog Season Risk Assessment for Maritime Transportation Systems Exploiting Himawari-8 Data: A Case Study in Bohai Sea, China

Zeng

Zhang

et al. 2021

Remote Sensing

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Sea fog is a disastrous marine phenomenon for ship navigation. Sea fog reduces visibility at sea and has a great impact on the safety of ship navigation, which may lead to catastrophic accidents. Geostationary orbit satellites such as Himawari-8 make it possible to monitor sea fog over large areas of the sea. In this paper, a framework for marine navigation risk evaluation in fog seasons is developed based on Himawari-8 satellite data, which includes: (1) a sea fog identification method for Himawari-8 satellite data based on multilayer perceptron; (2) a navigation risk evaluation model based on the CRITIC objective weighting method, which, along with the sea fog identification method, allows us to obtain historical sea fog data and marine environmental data, such as properties related to wind, waves, ocean currents, and water depth to evaluate navigation risks; and (3) a way to determine shipping routes based on the Delaunay triangulation method to carry out risk analyses of specific navigation areas. This paper uses global information system mapping technology to get navigation risk maps in different seasons in Bohai Sea and its surrounding waters. The proposed sea fog identification method is verified by CALIPSO vertical feature mask data, and the navigation risk evaluation model is verified by historical accident data. The probability of detection is 81.48% for sea fog identification, and the accident matching rate of the navigation risk evaluation model is 80% in fog seasons.

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Navigation risk assessment method based on flow conditions: A case study of the river reach between the Three Gorges Dam and the Gezhouba Dam

Cited by 31 publications

References 19 publications

Implementation of a Local Time Stepping Algorithm and Its Acceleration Effect on Two-Dimensional Hydrodynamic Models

Implementation of a Local Time Stepping Algorithm and Its Acceleration Effect on Two-Dimensional Hydrodynamic Models

Effect of ship-lock-induced surges on navigation safety in a branched lower approach channel system

Fog Season Risk Assessment for Maritime Transportation Systems Exploiting Himawari-8 Data: A Case Study in Bohai Sea, China

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